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Rb25 Turbo On Rb20det

Wogan

By Wogan,
in Western Australia

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Pattygtst Veteran

Pattygtst

Posted
Posted (edited)

More then likely faulty actuator. If you get a new one get one rated as close to psi you want to run.

I was getting full boost on a 3076r at 5500rpm changed the actuator to a garrett 18psi one and it hit full boost at 3900rpm. My ebc helps though it keeps the gate shut too.

I got mine done at hyperdrive too. Did Andrew tell you why it was laggy?

Edited by Pattygtst
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Wogan Proficient

Wogan

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nah Andrew didn't say anything about it being laggy.. only commented on the power dropping off saying i had a flow restriction, but i'm pretty sure the restriction is the turbo.. i've replaced pretty much everything else in the air flow path.

i've got the car pulled apart at the moment so i'll check out the actuator and make sure it is letting the wastegate close completely when i put it back on... guess i'll look into an EBC then since the general consensus is that i'll get on boost about a thousand rpm earlier.

thanks all

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Tezzah Experienced

Tezzah

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The ebc wont do that IMO.

Measure the position of the piston/shaft of the actuator with the car turned off.

Turn it on and see if it has moved while idling. If it has moved (granted that the position of the shaft when the car is off is fully closed....) then the actuator is not capable of keeping the wastegate fully closed under no load, therefore an EBC wont help u.

Just borrow someone's working actuator to eliminate it once and for all.

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Wogan Proficient

Wogan

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I've got my old RB20 actuator sitting at the workshop if you want to borrow it.

that'd be awesome thanks mate.. once my car is working again i'll come pick it up.

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